Members of the Colorado National Guard, called in to suppress the UMW strike against CF&I, pose near the water tank and the Colorado and Southern tracks on Water Tower Hill near Ludlow, Las Animas County, Colorado.

Boys march in support of UMW coal miners on strike against CF&I in Trinidad, Las Animas County, Colorado, carrying signs: "We Represent the CF&I Prosperity Slaves," "Let The Public take Over The Mines," "Colorado Civilization Turn Us Out in the...

A man inspects an underground shelter at the UMW camp for coal miners on strike against CF&I in Forbes, Las Animas County, Colorado, in which women and children died during a fire set by the Colorado National Guard.

A girl wears a striped dress, high-button shoes, and holds a doll while she poses by a window with lace curtains. She is the child of a UMWA coal miner on strike against CF&I, in Ludlow, Las Animas County, Colorado.

UMWA coal miners on strike against CF&I pose in a tent near the Mt. San Raphael Hospital in Trinidad (Las Animas County), Colorado. The men wear aprons and stand by an ornate cast iron stove. One holds a knife and sharpening rod; the other checks a...

Portrait of men, women, and children at the UMW camp for coal miners on strike against CF&I in Ludlow, Las Animas County, Colorado; also shows a canvas tent with lettering; "Made for the Neeley-Caldwell Hardware Co., Walsenburg, Colo."

View of the Cardiff Fuel and Coke Ovens located at County Road 116, Glenwood Springs, Colorado. Also known as the Colorado Fuel and Iron Coke Ovens, these brick "beehive" structures turned coal into coke for the CF&I Steel Mills in Pueblo,...

Crecencio Vigil and Melitón Barela, marshals at the Colorado Fuel and Iron Cokedale Mines in Cokedale (Las Animas County), Colorado. They pose near a dugout structure with a roof made from pine boughs. Crecencio (left) wears a hat, coat and boots....

Members of the Colorado National Guard, sent to suppress the UMWA strike against CF&I, pose next to a mule, with pistols drawn, in a camp near Ludlow, Las Animas County, Colorado. A howitzer canon is nearby.

View of a coal mine and camp owned by the Colorado Fuel and Iron Company in Morley (Las Animas County), Colorado. A group of men and women stand near covered wagons close to the camp. The CF&I stables are in the distance.

Members of the Colorado National Guard, sent to quell the demonstrations in support of the UMW Ludlow strike against CF&I, march down Main Street, near the McCormick building, Trinidad, Las Animas County, Colorado. Spectators stand nearby....

Members of the Colorado National Guard, called in to suppress the UMWA strike against CF&I, stand and crouch near a tripod-mounted automatic rifle, on Water Tank Hill near Ludlow, Las Animas County, Colorado.